Sparkfun

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US$34.93
Equip your Edison with a graphic display using the Edison OLED Block! Simply snap this board onto your Edison to gain access to a 0.66", 64x48 pixel monochrome OLED. To add some control over your Edison and the OLED, this board also includes a small joystick and a pair of push-buttons which can be used them to create a game, file navigator, or more!
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US$34.93
The Battery Block brings a single cell LiPo Charger and 400mah battery to power an Intel® Edision and expansion cards. The Battery board can be used with an external battery to increase runtime of your Edison which can be pluged in with a micro USB cable to charge.
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US$7.43
The MCP4725 is an I2C controlled Digital-to-Analog converter (DAC). A DAC allows you to send analog signal, such as a sine wave, from a digital source, such as the I2C interface on the Arduino microcontroller.
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US$3.43
Each 3 position block offers a screw pitch of 10mm with a max current of 15A and a max voltage tolerance of 600V before risking meltdown or implosion.
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US$5.53
This is a 3-terminal microswitch two pack, each equipped with a 17mm lever actuator. These switches have a great ‘clicky’ sound to them with a nice tactile feel and are perfect when used for a slider, 3D printer, or robot project. Each microswitch is rated for 5A at 250VAC.
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US$5.53
Each lead in this pack of ten is 50cm long with a rubber shrouded alligator clip on each end. There are five different colors, you get two each of: red, green, white, black and yellow.
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US$7.81
This is an awesome little microSD USB reader. Just slide your microSD card into the inside of the USB connector, then stick this into a USB port and the card’s contents will pop up on your computer. 
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US$4.92
This is a PTH Addressable RGB LED with a WS2812 control IC built right into the LED.
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US$34.93
Xbee radios are an awesome way to add wireless capability to your Arduino project and now it’s even easier with the XBee Shield. The shield form-factor mates directly with any dev board that has an Arduino standard footprint and equips it with wireless communication capabilities using the popular XBee module. 
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US$83.93
This is the MS5803-14BA Pressure Sensor Breakout, a high resolution pressure sensor with both an I2C and SPI interface. This MEMS pressure sensor measures the absolute pressure of the fluid around it which includes air, water, and anything else that acts like a viscous fluid.
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US$4.92
These are PTH Addressable RGB LEDs with a WS2812 control IC built right into the them.
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US$8.78
This is your simple three conductor sensor cable with electrode pad leads. These cables are 24" long and feature a 3.5mm audio jack connector on one end with snap style receptacles for biomedical sensor pads.
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US$12.54
This is a 10 pack of Biomedical Sensor Pads, disposable electrodes that can be used to measure EEG, ECG and EMG levels. These little pads are perfect for short-term monitoring of Neurofeedback and Biofeedback purposes.
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US$4.19
SD cards are all over the place and they’re great for storing large amounts of data. Why not take advantage by adding an SD socket to your next data heavy project. We use it on a whole bunch of our boards! The SD/MMC ( Secure Digital Disk / Multi Media Cards) cards use a very simple SPI serial bus as well as a 4-bit proprietary bus.
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US$15.06
With SD and MMC memory prices dropping, the time is right for mass storage and datalogging. This breakout board will allow you to breakout the SD/MMC socket to a standard .1" 10-pin header. Perfect for breadboarding and the likes. Board comes fully assembled and tested as shown.
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US$39.05
This is a simple to use, USB to serial base unit for the Digi XBee line. This unit works with all XBee modules including the Series 1 and Series 2.5, standard and Pro version. Plug the unit into the XBee Explorer, attach a mini USB cable, and you will have direct access to the serial and programming pins on the XBee unit.
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US$7.53
This is a basic SMA (Sub-Miniature A) male to female connector cable. Each cable is 25cm (9.8") long and has a 50Ω impedance that can handle frequencies up to 17 GHz. 
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US$5.25

If you are looking for a great addressable LED in the more common LED form factor, then this is the perfect choice for you. Features: Power Supply: DC 4.5V - 6V. Internal Frequency: 800K Hz. Single Wire Single Transmission.

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US$7.55 US$6.99
This is a small board that connects to the Raspberry Pi’s 26-pin GPIO connector, and breaks the pins out to breadboard-friendly arrangement and spacing, and even adds a couple of decoupling capacitors on the power supply lines.
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US$39.05
With the XBee Explorer Dongle you can plug the unit directly into your USB port and have it act as a gateway between your computer and the XBee. No cables needed! This unit works with all XBee modules including the Series 1 and Series 2.5, standard and Pro version. The on-board voltage regulator is good up to 500mA.
Delivery within 2-3 weeks
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US$2.03
This is a 2x23 pin male PTH header. This piece is in the common configuration for Beaglebone Black headers that can be broken apart to form smaller header formations. Each pin has a spacing of 0.1" in between each other.
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US$4.48
This is a 2x23 pin female PTH header, with extra long legs which makes great for stacking. This piece is in the common configuration for Beaglebone Black headers. Each pin has a spacing of 0.1" in between each other.
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US$26.61

If you need to charge LiPo batteries, this simple charger will do just that, and do it fast! The USB LiPo Charger is a basic charging circuit that allows you to charge 3.7V LiPo cells at a rate of 500mA or 100mA. It is designed to charge single-cell Li-Ion or Li-Polymer batteries.

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US$15.32
These cases protect your Arduino Uno from things like rogue wires that might short it out while still allowing full access to the board!
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US$24.20
This little breakout that uses the DS1307 to keep track of the current year, month, day as well as the current time. 
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US$9.73

This is a great inexpensive option for wireless communication; it's an ISM band FSK transceiver module implemented with a unique PLL. These modules operate in the 434MHZ band and fully comply with FCC and ETSI regulations.

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US$15.33

This is a small and very easy to use audio sensing board with three different outputs. The Sound Detector not only provides an audio output, but also a binary indication of the presence of sound, and an analog representation of its amplitude.

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US$0.96
This is a simple 2x3 male PTH header. This header is in the common configuration for an ISP connector. Each pin has a spacing of 0.1" in between each other.
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US$4.92
This is the Mini Solder-able Breadboard. A bare PCB that is the exact size as our mini modular breadboards with the same connections to pins and power rails. This board is especially useful for preserving a prototype or experiment you just created on a solderless breadboard by soldering all the pieces in place.
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US$67.50

This complete module is built upon the same technology as the ET-301, but includes on-board voltage regulation, LED status indicator, battery backed RAM, and a built-in patch antenna! 6-pin interface cable included. This EM-506 GPS module is powered by SiRF Star IV, it can provide you with superior sensitivity and performance even in urban canyon and dense foliage environment.

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US$7.14
This is a simple board that breaks out a female USB type A connector's VCC, GND, D- and D+ pins to a 0.1" pitch header. If you want to add a USB to your project, but don't want to put up with soldering tiny connectors, this is the board for you.
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US$2.73
These 6-pin connectors are very similar to the RJ11s we use here in North America except instead of a bottom-mounted hook lock, the BTA uses a side-mounted lock. These BTA connectors are perfect for educators or other users who need to set up a Custom Vernier analog sensor which produces a voltage that changes from high to low or vice versa.
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US$5.53
With 170 tie points there's just enough room to build and test simple circuits; They're also great for breaking out DIP package ICs to jumper wires! If you run out of room, no worries, these mini breadboards can be snapped together to form larger stretches of board. Dimensions: 47 x 35 x 10mm.
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US$27.93
This tiny little board does all of the neat-o Arduino tricks that you're familiar with: 4 channels of 10-bit ADC, 5 PWM pins, 12 DIOs as well as hardware serial connections Rx and Tx.
Delivery within 2-3 weeks
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US$2.73
This holder features a removable, sliding cover, which is secured with a small phillips head screw. Another bonus is the ON/OFF switch which can be used to control power to your project.
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US$13.93
This is an add-on for your RedBot that provides bump and motion detection. The sensor works by measuring acceleration forces on the x, y, and z axis. By measuring the amount of acceleration (or lack there of) your robot can get a better understanding of its movements.
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US$8.33
These simple switches are the Mechanical Bumper sensor for the SparkFun RedBot, giving you the ability to detect a collision before it really happens. When the "whisker" bumps into a foreign object it will make contact with a nut next to it, closing the connection and, by default, turning off the motor.
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US$3.93
This simple board breaks out a micro-B USB connector's VCC, GND, ID, D- and D+ pins to a 0.1" pitch header. If you want to add the popular micro-B USB to  your project, but don't want to put up with soldering the tiny connector, this is the board for you.
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US$2.73
This is the LM3914 Dot/Bar display analog-controlled LED driver that uses an alinear output scale. With this driver all it takes is a single, analog signal to drive a string of 10+ LEDs, which can be configured into either bar mode (where all LEDs below a certain point turn on) or dot mode (with only a single LED on at a time).
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US$3.85
This 0.012" Flexinol® Actuator Wires (aka shape memory Nitinol) is a one foot long piece of nickel-titanium alloy that can flex and contract when a specific amount of heat or current is applied to it and are made specifically for linear actuators to replace small motors or solenoids.
Delivery within 2-3 weeks
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US$0.91
This is a very basic 5mm purple LED. It has a typical forward voltage of 3.4V and a rated forward current of 30mA.
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US$18.32
This is a small chainable 1.75" (44.5mm) outer diameter board equipped with 5050 WS2812 RGB LEDs. The WS2812s are each addressable as the driver chip is located inside the LED. Each NeoPixel Stick has ~18mA constant current drive so the color will be very consistent even if the voltage varies, and requires 5V.
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US$13.93
This is a breakout board for the Bosch BMP180 high-precision, low-power digital barometer. The BMP180 offers a pressure measuring range of 300 to 1100 hPa with an accuracy down to 0.02 hPa in advanced resolution mode.
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US$28.06
This plugs directly into your USB port and provides a programming socket for the ATTiny45 and 85. Just slot an ATtiny into the socket, plug the programmer into your USB port and start up the Arduino IDE.
Delivery within 2-3 weeks
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US$7.81
This is the Solder-able Breadboard. A bare PCB that is the exact size as our regular breadboard with the same connections to pins and power rails. This board is especially useful for preserving a prototype or experiment you just created on a solderless breadboard by soldering all the pieces in place.
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US$2.73
This is a simple coin cell battery holder that can enclose two CR2032 batteries inside itself, and safely kept closed via two phillips head screws. Each battery holder is equipped with an On/Off slide switch and two 6" power wires (one positive and one negative) on the back.
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US$5.69
This is a pack of basic red, yellow, blue and green 5mm LEDs (5 of each) all conveniently packaged in a nice reusable ESD safe bag.
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US$5.88
They have a very fine tip which allows you to pick up very small parts with precision. This is a great tool to have if you're working with surface mount components or anything with very small parts. The ESD-safe coating will also help prevent electro-static damage to sensitive electronic components.
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US$5.88
They have a very fine tip which allows you to pick up very small parts with precision. This is a great tool to have if you're working with surface mount components or anything with very small parts. The ESD-safe coating will also help prevent electro-static damage to sensitive electronic components.
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US$1.33
TRRS connectors are the audio-style connectors that you see on some phones, MP3 players and development boards. TRRS stands for "tip, ring, ring, sleeve," which reflects the fact that, unlike a standard stereo connector, this actually has three conductors and a ground.
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US$15.25
This durable roll up tool bag provides you with 23 pockets to store your, pliers, flush cutters, hand-held soldering iron, spent uranium rods, screw drivers, and other small hand tool that you might need to complete a project. It even has 15 elastic loops concealed underneath a flap for storing small tools.
Delivery within 2-3 weeks
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US$8.19
Each pack includes 25 tiny green 1206 SMD LEDs in cut-tape packaging. These are great for status lights or for building really small LED matrices.
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US$8.78
Each pack includes 25 tiny white 1206 SMD LEDs in cut-tape packaging. These are great for status lights or for building really small LED matrices. 
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US$6.93
Eeach pack includes 25 tiny blue 1206 SMD LEDs in cut-tape packaging. These are great for status lights or for building really small LED matrices.
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US$4.97
Each pack includes 25 tiny red 1206 SMD LEDs in cut-tape packaging. These are great for status lights or for building really small LED matrices. 
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US$6.93
It has 2 power buses, 30 columns, and 10 rows - a total of 400 tie in points. All pins are spaced by a standard 0.1". The two sets of five rows are separated by about 0.3", perfect for straddling a DIP package over. The board accepts wire sizes in the range of 29-20AWG. Dimensions: 3.29 x 2.15 x 0.33" (83.5 x 54.5 x 8.5mm).
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US$8.33

These SparkFun needle tipped multimeter probes are great for attaching to multimeters, power supplies, oscilloscopes, function generators, etc. Dimensions: 36" Long.

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US$90.93
This is very similar to our BlueSMiRF modem, but it is designed specifically to be used with our Arduino Pros and LilyPad Arduinos. These modems work as a serial (RX/TX) pipe, and are a great wireless replacement for serial cables. Any serial stream from 2400 to 115200bps can be passed seamlessly from your computer to your target. We've tested these units successfully over open air at 350ft (106m)!
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US$14.46
This is a bare non-addressable 1 meter long RGB LED strips that come packed with 60 WS2801s per meter.
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US$33.85

These are bare addressable 1 meter long RGB LED strips that come packed with 60 WS2812s per meter. As these are bare LED strips that have no protective coating, your project won't be water proof but there is access to each WS2812 LED and each strip length can be easily modified.

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US$153.93

These are bare addressable 5 meter long RGB LED strips that come packed with 60 WS2812s per meter. As these are bare LED strips that have no protective coating, your project won't be water proof but there is access to each WS2812 LED and each strip length can be easily modified. You will be able to control each LED RGB individually giving you the ability to create cool lighting effects for your car or perhaps under cabinet lighting in your kitchen!

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US$5.53
With 170 tie points there's just enough room to build and test simple circuits; They're also great for breaking out DIP package ICs to jumper wires! If you run out of room, no worries, these mini breadboards can be snapped together to form larger stretches of board. Dimensions: 47 x 35 x 10mm.
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US$5.53
With 170 tie points there's just enough room to build and test simple circuits; They're also great for breaking out DIP package ICs to jumper wires! If you run out of room, no worries, these mini breadboards can be snapped together to form larger stretches of board. Dimensions: 47 x 35 x 10mm.
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US$8.33

This is for the incredibly small TMP102 digital temperature sensor. The TMP102 is a digital sensor (I2C a.k.a. TWI), has a resolution of 0.0625°C, and is accurate up to 0.5°C. This is a very handy sensor that requires a very low-current.

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